Cleanup Crew Question

This is a discussion on Cleanup Crew Question within the Coral and Reef Creatures forums, part of the Advanced Saltwater Discussion category; -->
Once I get the levels in my tank stabilized I'm guessing the first thing to do is get more live rock. Will this send ...

Once I get the levels in my tank stabilized I'm guessing the first thing to do is get more live rock. Will this send my tank into a mini cycle, making it unsafe to start adding inverts, or will it be ok? I only need to add another 8-10lbs of rock, but I probably won't be adding it all at once.

But on the subject of inverts, I will need to get a cleanup crew eventually. My tank is 20g and I plan on having a reef tank. What would be some good inverts to have as a cleanup crew. I have one snail and a few hermits in there already. (I used to have near 20 hermits, but they fought over shells and killed each other, even though I gave them shells of varying size. They had no interest in them.)

My startup for the tank has been slow due to limited funds. I could not go out and buy all $220+ worth of rock all at once. I only have 8-10lbs to go. I was told by the LFS as well as members of this site that I could add them over time as long as I would be mindful of the possibility of mini-cycles.

As far as a cleanup crew, I've had problems with algae in the past (it took over the tank, especially the walls) so something that could help with that would be great, and I also want something that will clean the sand (missed food, detritus, ect) My substrate is around 1-2 inches deep.

Well I got 6lbs of live rock today and added them into the tank. Only 4lbs to go (1 rock). So that will give me a small cycle which I will keep track of. Hopefully next week or so I can add the remaining rock and be done with my cycling by the end of June. Then its on to the cleaning crew!